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A293467 as a simple table

na(n)
01
10
20
3-1
4-3
5-7
6-14
7-25
8-41
9-64
10-100
11-165
12-294
13-550
14-1023
15-1795
16-2823
17-3658
18-2882
192873
2020435
2162185
22148863
23314008
24613957
251155794
262175823
274244026
288753538
2919006490
3042471787
3195234575
32210395407
33453413866
34949508390
351931939460

[1,0,0,-1,-3,-7,-14,-25,-41,-64,-100,-165,-294,
 -550,-1023,-1795,-2823,-3658,-2882,2873,20435,
 62185,148863,314008,613957,1155794,2175823,
 4244026,8753538,19006490,42471787,95234575,
 210395407,453413866,949508390,1931939460]